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[media] cx24120: i2c-max-write-size is now configurable

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Some i2c-hosts are quite limited regarding maximum
i2c-burst-write-sizes. This patch makes the previously
hardcoded field configurable by users of the driver.

Signed-off-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Patrick Boettcher 2015-04-28 02:47:42 -03:00 committed by Mauro Carvalho Chehab
parent c5fb0f5f54
commit f7a77ebf08
3 changed files with 26 additions and 16 deletions
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1
drivers/media/common/b2c2/flexcop-fe-tuner.c
View File

@ -630,6 +630,7 @@ static const struct cx24120_config skystar2_rev3_3_cx24120_config = {
.xtal_khz = 10111,
.initial_mpeg_config = { 0xa1, 0x76, 0x07 },
.request_firmware = flexcop_fe_request_firmware,
.i2c_wr_max = 4,
};
static int skystarS2_rev33_attach(struct flexcop_device *fc,

38
drivers/media/dvb-frontends/cx24120.c
View File

@ -209,46 +209,53 @@ static int cx24120_writereg(struct cx24120_state *state, u8 reg, u8 data)
}
/* Write multiple registers */
/* Write multiple registers in chunks of i2c_wr_max-sized buffers */
static int cx24120_writeregN(struct cx24120_state *state,
u8 reg, const u8 *values, u16 len, u8 incr)
{
int ret;
u8 buf[5]; /* maximum 4 data bytes at once - flexcop limitation
(very limited i2c-interface this one) */
u16 max = state->config->i2c_wr_max > 0 ?
state->config->i2c_wr_max :
len;
struct i2c_msg msg = {
.addr = state->config->i2c_addr,
.flags = 0,
.buf = buf,
.len = len };
};
msg.buf = kmalloc(max + 1, GFP_KERNEL);
if (msg.buf == NULL)
return -ENOMEM;
while (len) {
buf[0] = reg;
msg.len = len > 4 ? 4 : len;
memcpy(&buf[1], values, msg.len);
msg.buf[0] = reg;
msg.len = len > max ? max : len;
memcpy(&msg.buf[1], values, msg.len);
len -= msg.len; /* data length revers counter */
values += msg.len; /* incr data pointer */
len -= msg.len; /* data length revers counter */
values += msg.len; /* incr data pointer */
if (incr)
reg += msg.len;
msg.len++; /* don't forget the addr byte */
msg.len++; /* don't forget the addr byte */
ret = i2c_transfer(state->i2c, &msg, 1);
if (ret != 1) {
err("i2c_write error(err == %i, 0x%02x)\n", ret, reg);
return ret;
goto out;
}
dev_dbg(&state->i2c->dev,
"%s: reg=0x%02x; data=0x%02x,0x%02x,0x%02x,0x%02x\n",
__func__, reg,
buf[1], buf[2], buf[3], buf[4]);
msg.buf[1], msg.buf[2], msg.buf[3], msg.buf[4]);
}
return 0;
ret = 0;
out:
kfree(msg.buf);
return ret;
}
@ -1434,7 +1441,6 @@ int cx24120_init(struct dvb_frontend *fe)
}
info("FW version %i.%i.%i.%i\n", vers[0], vers[1], vers[2], vers[3]);
state->cold_init = 1;
return 0;
}

3
drivers/media/dvb-frontends/cx24120.h
View File

@ -37,6 +37,9 @@ struct cx24120_config {
int (*request_firmware)(struct dvb_frontend *fe,
const struct firmware **fw, char *name);
/* max bytes I2C provider can write at once */
u16 i2c_wr_max;
};
#if IS_REACHABLE(CONFIG_DVB_CX24120)